Stereoscopic image system employing an electronic controller which controls the polarization plane rotator in synchronization with an output image of the display device

Abstract

Provided is a stereoscopic image system. The stereoscopic image system includes a display device radiating linearly polarized light, glasses including left and right oculars each including a first polarizer disposed between the display device and the eyes of a user, a second polarizer disposed between the first polarizer and the eyes of the user, and a polarization plane rotator disposed between the first polarizer and the second polarizer, and a quarter wave plate disposed between the display device and the first polarizer. Accordingly, even when the glasses are rotated around a normal line to surfaces of the left and right oculars, a change in the brightness of a stereoscopic image can be reduced.

What is claimed is: 
     
       1. A stereoscopic image system comprising:
 a display device which radiates linearly polarized light; 
 glasses comprising a left ocular and a right ocular respectively corresponding to a left eye and a right eye of a user, wherein the left ocular comprises a first left polarizer disposed between the display device and the left eye of the user, a second left polarizer disposed between the first left polarizer and the left eye of the user, and a left polarization plane rotator disposed between the first left polarizer and the second left polarizer of the left ocular, and 
 wherein the right ocular comprises a first right polarizer disposed between the display device and the right eye of the user, a second right polarizer disposed between the first right polarizer and the right eye of the user, and a right polarization plane rotator disposed between the first right polarizer and the second right polarizer; 
 an electronic controller which controls the left polarization plane rotator and the right polarization plane rotator in synchronization with an output image of the display device; and 
 a quarter wave plate disposed between the display device and the first left polarizer of the left ocular and the first right polarizer of the right ocular, 
 wherein a fast axis of the quarter wave plate is inclined at 45 degrees with respect to a polarization axis of one of the first left polarizer of the left ocular and the first right polarizer of the right ocular, and 
 wherein the quarter wave plate comprises a left quarter wave plate and a right quarter wave plate, the left quarter wave plate disposed between the display device and the first left polarizer of the left ocular and the right quarter wave plate disposed between the display device and the first right polarizer of the right ocular. 
 
     
     
       2. The stereoscopic image system of  claim 1 , wherein the display device is a liquid crystal display (LCD). 
     
     
       3. The stereoscopic image system of  claim 1  wherein the first left polarizer, the first right polarizer, the second left polarizer, the second right polarizer and the quarter wave plate are provided in a form of films. 
     
     
       4. The stereoscopic image system of  claim 1 , wherein the quarter wave plate is attached to a screen of the display device. 
     
     
       5. The stereoscopic image system of  claim 1 , wherein a polarization axis of one of the first left polarizer of the left ocular and the first right polarizer of the right ocular and a polarization axis of a corresponding one of the second left polarizer of the left ocular and the second right polarizer of the right ocular are perpendicular to each other. 
     
     
       6. The stereoscopic image system of  claim 1 , wherein a polarization axis of one of the first left polarizer of the left ocular and the first right polarizer of the right ocular and a polarization axis of a corresponding one of the second left polarizer of the left ocular and the second right polarizer of the right ocular are parallel to each other.